Model for overscreened Kondo effect in ultracold Fermi gas

I. Kuzmenko, T. Kuzmenko, Y. Avishai, K. Kikoin

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


The feasibility of realizing the overscreened Kondo effect in ultracold Fermi gas of atoms with spin s≥32 in the presence of a localized magnetic impurity atom is proved realistic. Specifying (as a mere example) a system of ultracold Na22 Fermi gas and a trapped Li6 impurity, the mechanism of exchange interaction between the Na and Li atoms is elucidated and the exchange constant is found to be positive (antiferromagnetic). The corresponding exchange Hamiltonian is derived, and the Kondo temperature is estimated at the order of 500 nK. Within a weak-coupling renormalization group scheme, it is shown that the coupling renormalizes to the non-Fermi-liquid fixed point. An observable displaying multichannel features even in the weak-coupling regime is the impurity magnetization that is negative for T-TK and becomes positive with decreasing temperature.

Original languageEnglish
Article number165131
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number16
StatePublished - 27 Apr 2015

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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